Why Choose the Mersen R300625 High-Speed Semiconductor Fuse?
The Mersen R300625, catalogue reference PC72UD11C630EF, is a Protistor® Size 72 high-speed semiconductor fuse designed to protect sensitive power-conversion equipment against damaging fault currents. Rated at 630A, the fuse supports operating voltages up to 1100VAC under IEC standards and 1200VAC under UL standards.
Its ultra-fast aR operating characteristic makes the R300625 particularly suitable for protecting power semiconductors such as diodes, thyristors and insulated-gate bipolar transistors. Rapid interruption helps limit the thermal and electrical energy transferred to valuable semiconductor devices during short-circuit conditions.
The fuse features a robust square ceramic body, silver-plated open-slot blade contacts and an integrated striker for fault indication or operation of a compatible microswitch. Its bolted mounting arrangement provides a secure connection in industrial power systems, variable-speed drives, rectifiers, inverters and other high-power electronic equipment.
Key Advantages
- Ultra-fast aR fuse characteristic for semiconductor protection.
- High 630A current rating for demanding power applications.
- Rated for up to 1100VAC IEC and 1200VAC UL.
- Integrated striker provides clear fuse-operation indication.
- Open-slot blade contacts support secure bolted installation.
- Low I²t performance helps minimise damage to semiconductor devices.
- Robust ceramic construction provides excellent thermal resistance.
- Silver-plated contact surfaces support dependable electrical conductivity.
Key Features
- Mersen Protistor® Size 72 fuse-link.
- Manufacturer part number R300625.
- Catalogue number PC72UD11C630EF.
- Square-body high-speed semiconductor fuse.
- aR partial-range protection characteristic.
- Designed for AC electrical systems.
- 630A rated current.
- 1100VAC IEC rated voltage.
- 1200VAC UL rated voltage.
- Integrated striker indication system.
- Open-slot blade terminal design.
- Bolted mounting configuration.
- Non-magnetic mounting hardware.
- Silver-plated electrical contact surfaces.
Fast and Reliable Semiconductor Protection
Power semiconductors can be damaged extremely quickly when exposed to excessive current. The Mersen R300625 uses specially engineered fuse elements embedded in solidified sand to control internal arcing and interrupt severe fault currents rapidly. This construction helps deliver low let-through energy and a high interrupting capability.
The fuse is designed for partial-range short-circuit protection and should be coordinated with the equipment’s overload-protection system. Correct fuse selection requires consideration of operating voltage, continuous current, prospective fault current, thermal cycling, cooling conditions and the I²t withstand capability of the protected semiconductor.
Typical Applications
- Variable-speed motor drives.
- Industrial power converters.
- Rectifiers and inverters.
- Uninterruptible power supplies.
- Battery energy-storage converters.
- Industrial heating equipment.
- Welding power supplies.
- Protection of diodes and thyristors.
- Protection of IGBT power modules.
- High-power automation equipment.
